3" is about 15% more than 2.6". That's significant.
In my experience, for comparison, a 2.4" is an entirely different
proposition than a 1.95". A fat tyre helps so much with just rolling
over stuff. I would extrapolate that a 3" would be even better at
rolling over stuff than a 2.4".
My limited experience is that super fat tyres also help with bouncing.
On the other hand, the extra weight will be a factor with changes of
speed and direction.
To my mind, the most important aspect of a tyre is its cross section:
rounded is good, squarish is bad. As I've posted elsewhere, the change
from Gazz to Holy Roller was an eye-opener for me. Virtually the same
size (2.3" and 2.4"😉 but the HR is 100 times easier to ride.
Ultimately, your tyre choice must depend on your experience, your
riding style, your likely terrain, and so on. How much mud? How many
rocks?
Be prepared to make purchasing errors, as you strive to build the
perfect unicycle for your riding style.
--
Mikefule
I don't know where I'm going, but I've got to get there soon
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